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Brown Dwarf A brown dwarf occurs if the protostar is too small to ignite fusion. http://chandra.harvard.edu/photo/2003/twa5b/twa5b_dwarf_ill.jpg

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Main Sequence http://www.astronomyexpert.co.uk/images/9392.jpg A protostar gets enough mass to ignite fusion. All main sequence stars fuse hydrogen. Stars spend most of their life in the main sequence stage.

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Red Giant http://home.comcast.net/~van.etten/Support/Red%20Giant.jpg A red giant is formed when a small to medium sequence star runs out of hydrogen and begins fusing helium.

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White Dwarf http://www.nasa.gov/centers/goddard/images/content/207358main_whitedwarf_20080102_HI1.jpg White Dwarf The white dwarf is the leftover core of a star. It is extremely dense. It may be the size the earth but has half the weight of the sun.

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Black Dwarf A white dwarf cools off after trillions of years and eventually stops emitting light. http://library.thinkquest.org/3103/nonshocked/topics/blackdwarfs/images/blackdwarfimg.gif

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Massive Main Sequence https://segue.atlas.uiuc.edu/uploads/ryemm2/blue%20main%20sequence.jpg Massive main sequence stars burn more quickly than small to medium mass main sequence stars because they fuse more hydrogen.

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Neutron Star http://media.arstechnica.com/journals/science.media/neutron_star.jpg The super dense core left over after a supernova is called a neutron star.

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Black Hole BLACK HOLE http://startswithabang.com/wp-content/uploads/2008/05/ashtekar_blackhole.jpg Stars with masses 25-50 times the mass of the sun form a black hole after the supernova. Other stars turn into Neutron Stars. Nobody knows what happens to things after they go into a black hole.